Is it SJW nonsense or just ignorance of history though?
More ignorance. Her rule was difficult because she was a woman and the Silla Dynasty was on its last legs. She was big on helping others and furthering the arts. She wasn't a military Queen so the surrounding forces took advantage of it.
Korean history textbooks don't really focus on females accomplishments. But she was far from terrible leader or even betrayer. I have no idea what that person is referring to.
Having said that, it is a bit odd to have her as the main leader and not Sejong. It would be like having John Adams as the US's iconic leader instead of Washington or Lincoln. Not a bad choice, just unconventional.
TLDR: She was a good/decent leader. The inclusion is odd. The sexism/ignorance of their history is real.